Stig Ingamansson’s Noise Control: Principles and Practice

B7 – Sound from Vibrating Plates – Resonance

RESONANCE AMPLIFIES NOISE BUT IT CAN BE DAMPED 

Resonance greatly increases noise from a vibrating plate, but it can be suppressed or prevented by damping the plate.  It may often be sufficient to damp only part of the surface, and, in some rare cases, damping of a single point is effective. 

Principle 

Application to metal working 

B8 – Sound from Vibrating Plates – Resonance 

RESONANCE SHIFTED TO HIGHER FREQUENCY IS MORE EASILY DAMPED 

Large vibrating plates often have low frequency resonances which can be difficult to damp.  If a plate is stiffened, the resonances are shifted to higher frequencies which can be more easily damped. 

Principle 

Application to a machine housing